1. Ph.D. Candidate, Dept. of Structural Engineering, State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji Univ., Shanghai 200092, China.
2. Professor, College of Civil Engineering, State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji Univ., Shanghai 200092, China (corresponding author).
3. Associate Professor, Dept. of Civil and Environmental Engineering, Virginia Tech, Blacksburg, VA 24061.
4. Ph.D. Candidate, Dept. of Structural Engineering, Tongji Univ., Shanghai 200092, China.